Transmission-gearing for motor-vehicles.



R. G. HARDGRAVE & c. T. ADAIR.

TRANSMISSION GEARING FOR MOTOR VEHICLES.

APPLICATION FILED D110 3, 1910.

Patented June 11,1912.

2 SHEETS-SHEET 1.

Witnesses R. G. HARDGRAVE & G. T. ADAIR. TRANSMISSION GEARING FOB MOTORVEHICLES.

APPLICATION TILED BBQ. 3, 1910.

1,028,876, Patented June 11, 1912.

2 SHEETS-SHEET 2.

, flaizl'ifilfmdymwz Witnesses ventors Attorneys rrnn srarns PATENTGFFTGE.

ROBERT GASTON HABDGBAVE AND CHARLES 1. ADAIR, Q13 TUCUMCARI, NEW MEXICO.

TRANSMISSION-GEARING FOR MO'IbR-VEHICLES.

Specification of Letters Patent.

Patented J une 11, 1912.

To all whom it may concern:

Be it known that we, ROBERT G. HARD- GRAVE and CHARLES T. ADAIR,citizens of the United States, residing at Tucumcari, in the county ofQuay, State of New Mexico, have invented a new and usefulTransmission-Gearing for Motor-Vehicles, of which the following is aspecification.

This invent-ion relates to transmission gearing for use on motorvehicles, its object being to provide two cooperating shiftable gearsunder the control of a single lever and which can be moved relative'toeach other so as to vary the speed of rotation of the driven gear and toreverse said gear.

Another object is to provide mechanism of this character utilizing buttwo gears, to wit: a drive gear and a driven, gear whereby motion istransmitted from the drive shaft to the drive axle.

A further object is to provide means for locking the gears againstmovement, said locking means being released by the depression of a footlever controlling the clutch.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of invention herein disclosed can be made within the scope ofwhat is'claimed without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings :Figure 1 is a view partly in plan and partly insection of the mechanism co'nstitut-ingthe present invention. Fig. 2 isa section on line AB Fig. 1. Fig. 3 is a section on line Fig. 1. Fig. 4is an enlarged transverse section through a portion of the casing andshowing the double-faced gear and its operating mechanism inrear-elevation. Fig. 5 is a side elevation of the connection between therock shaft and shifting rod of the drive gear, said rock shaft beingshown in section. Fig. 6 is an enlarged view showing a portion of thecontrolling lever in elevation and the rock shaft in section. Fig. 7 isa view partly in section and partly in elevation and showing theconnection between the gear shifting mechanism and the clutch.

Fig. 8 is an elevation of the guide of the drive gear.

Referring to the figures by. characters of reference 1 designates theframe or chassis of the motor vehicle the rear axle 2 of which supportsa casing 3 from which extends a tubular housing 4. A drive shaft 5 ismounted for rotation within this housing and is slidably engaged by theangular portion 6 of a shaft extension 7 carrying a drive gear 8. A rod9 is connected to the shaft extension 7 in any suitable manner, as bymeans of a collar 10 and this rod is attached to a crank arm 11 at theinner end of a rock shaft 12. Said shaft is journaled, at its outer end,in a bracket 13 connected with the frame 1 and projects through anopening 14 formed within a lever 15. Trunnions 16 extend laterally fromthe rod and engage the walls of the opening 14 so that, while the shaft12 can be rocked by means of the lever, said lever can also be swungrelative to the shaft. I 1

'The shaft 17 journaled within axle 2 and to which the rear supportingwheels 18 are secured, is provided with the usual differential gear 19.A collar 20 is feathered on the axle 2 and has arms 2lextendingtherefrom and loosely engaging an annularly grooved hub projecting fromone face of a gear 22 of novel construction. This gear is in the form ofa double faced bevel gear,

there being an annular series of teeth 23 upon one face thereof at itsperiphery while another annular series of teeth 24 is formed on theother face of the gear at the periphery thereof. Two or more additionalseries of annular teeth, such as indicated at 25 and 26 1 may be formedon the same face of the gear with the teeth 24, the several series ofteeth being at difierent distances from the center of the gear.

A shaft 27 extends longitudinally within nected to and mounted withinthe casing 3. A rod 34 is secured to and extends from the dog andisattached to a crank arm 35 extending from a rock shaft 36 journaledwithin the front portion of the frame 1. Another crank arm 37 extendsfrom this shaft 36 and is connected as by means of a rod 38, to a bellcrank lever 39, one arm of this lever being attached, as by means of alink 40, to a dog 41. This dog is pivotally mounted on the casing 3 andnormally engages teeth 42 extending from therod 9. A foot lever 43projects upwardly from the shaft 36 and a spring 44, which is attachedto said lever and to the frame 1, serves to hold the lever normallyelevated and the dogs 33 and 41 normally in engagement with the adjacentteeth.

The bracket 13 heretofore referred to is provided with a series ofnotches, such as indicated at 45 and any one of which is adapted toreceive the lever 15 and thus hold it against lateral swinging movement.

Shaft 36 has an arm 46 loosely engaged by an angular member 47 extendingfrom a yoke 48. Said yoke loosely engages the annularly grooved hub 49of a clutch member 50, said clutch member being feathered on the shaft 5and being mounted for rotation within a cup like clutch member 51revoluble with the shaft of the motor 52.

Whenever it is desired to disengage the gears 8 and 22, it is merelynecessary to swing the lever 15 forwardly after first releasing the dogs33 and 41 from the teeth adacent thereto by depressing foot lever 43.This operation will result in the withdrawal of the gear 8 from meshwith gear 22 and the operation of the motor will not, therefore, resultin the driving'of the rear wheels of the vehicle. To drive the machineat high speed, lever 15 is shifted laterally after the dogs 33 and 41have been disengaged from the teeth adjacent thereto, so as to move gear22 until the teeth 26 are brought into the path of gear 8. Lever 15 isthen drawn back into the outermost notch 45,

thus causing gear 8 to move backwardly until it is brought into meshwith the teeth 26. To change the gearing so as to drive at medium speed,lever 15 is swung forwardly so as to shift gear 8 out of engage mentwith gear 22 and is then swung laterally until the teeth 25 are broughtinto the path of gear 8. Said lever is then swung back into the secondnotch and thus causes gear 8 to move into mesh with the teeth 25. Theslow speed adjustment is attained by shifting lever 15 forward todisengage gear 8 from gear 22 and then swinging said lever laterally tobring the teeth 24 into the path of gear 8 after which the lever 15 isswung "back into the third notch, thus bringing gear -8 into mesh withteeth 24. The machine can be reversed by shifting lever 15 for- Wardlyto move gear 8 out of the path of gear 22 and then shifting the leverlaterally to bring the teeth 23 into the path of gear 8. By thenswinging the lever 15'back to the fourth or innermost notch 45, the gear8 can bebrought into mesh with the teeth 23. It is to be understood thatnone of these movements of the lever can be effected unless the dogs 33and 41 have first been disengaged from the teeth adjacent thereto.

In order that the gear 8 may be properly guided and held at all timesagainst lateral movement relative to the gear 22,up'per and lower guiderods 53 are secured within the casing 3 and extend parallel with shaft7. These rods are engaged by the end portions of a V-shaped slide 54,shaft 7 being jour naled within the apex portion of the slide. Anysuitable means may be employed'for preventing the shaft 7 from shiftinglongitudinally within the slide so that, when the shaft is moved bymeans of the mechanism provided therefor, a corresponding movement isimparted to the slide.

What is claimed is 1. Transmission gearing including separate gears, oneof said gears having an annular series of teeth upon one face thereofand a plurality of annular series of teeth upon the opposite facethereof, means under the control of the operator 'for locking said gearsagainst movement, and means for successively shifting the gears to placeone of said gears in mesh with any series of teeth upon the other gear.I

2. Mechanism of the class described, including a driven gear having anannular series of teeth upon each face thereof, a drive gear, anactuating lever, and separate means operated by said lever for shiftingthe driven gear to bring either series of teeth into the path of thedrive gear and subsequently moving the drive gear into mesh with saidseries and means for automatically locking the gears against relativedisplacement.

3. Mechanism of the class described including a drive gear, a drivengear having annular series of teeth upon the two faces thereof, separatedevices co'eperating' with the respective gears'for locking said gearsoperated thereby for shifting said gear, a

drive gear, an actuating shaft, means operated by said shaft forshifting the drive gear toward or away from the driven gear, anoperating lever for rotating said shaft,

said lever being mounted to swing relative to the shaft, and aconnection between the lever and the first mentioned rock shaft fortransmitting motion to said shaft from the lever.

5. Mechanism of the class described including a driven gear having aplurality of annular series of teeth, a rock shaft, means operatedthereby for shifting said gear, a drive gear, an actuating shaft, meansoperated by said shaft for shifting the drive gear toward or away fromthe driven gear, an operating lever for rotating said shaft, said leverbeing mounted to swing relative to the shaft, and a connection betweenthe lever and the first mentioned rock shaft for transmitting motion tosaid shaft from the lever, and separate toothed members movable with therespective gears, separate means for engaging said members to hold thegears against movement, and means for simultaneously releasing thegears.

In testimony that we claim the foregoing as our own, we have heretoafiixed our signatures in the presence of two witnesses.

ROBERT GASTON HARDGRAVE. CHARLES T. ADAIR. Witnesses:

C. C. DAvmsoN, HARRY H. MOELROY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C. V

